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Labradorite
Labradorite
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Smithsonite
Smithsonite
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Labradorite
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Smithsonite
Physical Properties

Tenacity

Solubility

Durability

Specific Gravity

Fracture

Cleavage

Mohs Hardness

Chemical Composition

 
-
-
-
2.69-2.72
Uneven, Conchoidal
Perfect on {001}, less perfect on {010}, intersecting at near 90°; distinct on {110}
6-6.5
(Na,Ca)1-2Si3-2O8
 
Brittle
-
-
4.00-4.65
Uneven, Sub-Conchoidal
Perfect on [1011]
5-5.5
ZnCO 3Michael O’Donoghue , Gems, Sixth Edition (2006) More from other references